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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfbf1ec8af929372a9872f3c743497704038eacc545649c6ef0293c4d23d903' 
  AND token = 'l9Wg9LZ29Mm0ll6JrsTyrd/ayusFvva4egk9oxzhtlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}