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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c9d1899d1e87fa71bf3a9f80b2b90dfe301a350777ee44962384ae8cca858d' 
  AND token = 'pt2pqxvnBqbg1MtRNBFd2NBmcdx8VnNfYQUkkaVfDhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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