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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7563d65cc33c62a36fd2f23008ae78b0624d537612e72fdef32161eb9ba0f3' 
  AND token = 'IFkMONeLdKTZqvQYSXJTSQDBpNEcOPwGNQBwKd4+0qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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