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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443d1a672011da9eae1408a4bffa91788ef9cd6bcbd3781a269630ab8c71f7d1' 
  AND token = 'q7snva1Dww2/bYvCR3R8BIM2bKdf33bqYifMOrdzs+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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