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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8246cc2ee406af7f47e8bdbe2e23831d49700daf6e1effb8b1059ebe1ec2f4' 
  AND token = '8qHWlJNevc5PJhK+V8ZAIJP6DUA+Z08T5dzVQrx0VGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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