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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504c8cef39ba5e9df247eede0902e0597e8abb6373fa82ac21cc569cde4f77da' 
  AND token = 'LboTBS29a0ol7wsdP9G2jx8Xmk5p1p4g6wSuqUq6UZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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