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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bedf7ea4eba7207e93bfe0bd8d994e40cd53e705f3029c4f1c66a1b5a1012a3' 
  AND token = 'QnLz/XeGZYYPjN5YZMWOeWcaCSRWj2QB+9MBkxdPCMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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