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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c1ba7b9dd21feffe6092e0af0768d6910c54cd7b221587c4ebe095ab5dc840' 
  AND token = 'ErumZxsvGFn2hrbrnJByZbiZ4644Kq9AjPw80jhro4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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