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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '349882e527c62866e8ba026b1cb9de404fce364b5b29bfa4165b75d861ce176e' 
  AND token = 'AybageY6bXawj8lan0DT+f9RN6o6+SkX+fwGg9XFLho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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