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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e4c09ffde9ccecd1f26a2ec5a4d8a9c7fac520fc4cfee735822f178ffc874f' 
  AND token = 'KiNqcrv8uNJPFHpFTJOQ3kxIJvYj0hiSmgLyIs1pLKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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