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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190d58b44836f1143ebd12dc451a5b48cb51208a42e3f186c05816df7d44b269' 
  AND token = 'mnggGxuI3RSwcxcZsAgthBExLDJrEUtjyQeaLfGHxxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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