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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414ad127bcdf70ba3c74f1946afc1b50becc8750d2c90a5c812233e7c3fde08f' 
  AND token = 'f4wu9va6Tj0g+GhTN9+xJrb6xs9jsLybTIwl0of9a94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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