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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f54945881f89fde6a6c41f6d6bc9b12d4d1fdedb86ae4ae33cce1bdb235241e' 
  AND token = 'mKC0JX/7aI7crzYgxFmyz6otX69rJn/ZggKF0yJGATY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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