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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3ac4682022f34d9c8eeb067ed96675874bddfc7bbf038246b8e2d4222631bf' 
  AND token = 'pMfJwWs3inqznaOWZcxv+JmBRUwve7O804S3P656VCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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