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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f289da5aededbe93ba63cf9811cb2f4915467caac916566bc532823c1ee7dd2' 
  AND token = 'vBoZROq8qY53T0bQd1iysvDd8Vclx9u7c0bQYvqXdyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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