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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4dacdfbb7eeac56cf47dd85993fe89b6f3f55009abd32d9505703de549eb9b' 
  AND token = 'srLzXCppBgwPH9hE0PhuRYRq7qvsmArfXMD5yKsWUGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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