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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32bcf9a539aea4dd335e396e37356a635a5041c135647e5d355367fff98e72d1' 
  AND token = 'pZ3An3a2L/h3wEwhcQZKf83hCXnCmruyrDfN3ekvnEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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