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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af422eb1f82fcee9de5392d8adec1cb641960ebad55f330109bb2de3e758301b' 
  AND token = 'Cs8c+B3IfmfMOmWQx4/me/KYjKVIaBxvaL6u/z8icdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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