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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ddedb247fefa985803286ad926920e98e7b39a37cf30c0c38fb83a65ed17bf6' 
  AND token = 'L9cdcYlc7NcQT2A/ZmMKtWzw9WEF3b1K9rNhAzbpvVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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