SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094302697d49df95785a52b85b57bf73d980ff98ac9d3c4c93b54b1cc665eca4' 
  AND token = 'jj79/aO4hz6Kptu7kYuKyMxvn+m9p7OGvpQYBsHuUWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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