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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6099df3756013c32440211d0253b934a8b07d8693d770d06b6466b1db7e02b6' 
  AND token = 'CpxpyHmvX7F6qar1YGK2Vsf27rEzKxe3kxYS3LaqM/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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