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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a353dba4e8982406bfda24812e2e35e9f075ab6fc44f0eaeccfd477e716ae3c' 
  AND token = '9lBhYAsib58asEhgx0UUTt3foEoOPHOUnVmbu51/rMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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