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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de432581a566ec1f64ae5c76201de4b4ef3b8faa1aae18f692435532e8616f8' 
  AND token = 'y3FwXZuqE3dni9MQ4Nt3Ilk99k+SiTyEzBnYS8fKnLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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