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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300832dc6fe4f8293ffdc78c527e7cde797fc9b1dc4c2c5ccd5eb48d5c95c085' 
  AND token = '1zIe1O2esu6/ywp30q/RZuIIPva1FO5AA0tCLL9kyUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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