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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92255862afef856612e491a5eeb7e3c49424d1a9331324f7b55136cca52d531' 
  AND token = 'g889dFShZElFjR6zTTM9cecJQS4seTuG6IXicS4xSQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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