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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5167820767afda5769e66cd3483da7946ec3ea59a2c2ca7dd9e4bb70bd684a7f' 
  AND token = 'FkdTpXTEMGuv5rOzvquo0h+TlAO2Aylx50ZXvVyxK+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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