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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb58c498d7633718ab1235ea5c6e5e6c78ed32025fae0d7b65321585dc697a29' 
  AND token = '+1PR5nWG17Ax47u4nmFueImkBRYjN3T4qUb9Vy6zAUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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