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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110fe1eaa5d56e6196c597542681441677833e9ceffb406a151165fe2e8d2b58' 
  AND token = 'F4EbRmZVaYjfr8J6z7ASKursxUYrpeDZqLmdf3oH6j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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