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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9900b77423deeafadd25ad3f0714c9a87bdc7ff1072ec808e194679485e8fdec' 
  AND token = '2pcgU3gitwaC5SY9mfP8nZMUWkf4WwJUxD6eZPC1khA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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