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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d36882f06175f9e28a51f5f6ed4467d67231fe71516b816aa0c33611f7e966' 
  AND token = 'lSX8rRAF9lC0ovyTZ9oUxiTKzjiZwHELpt1SouVwv8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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