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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deee6af645c2f762c2f898d8f45af81805e57bcb528160013dc86b8bf0d3621a' 
  AND token = 'yoJbZ5yC+jytlug2XHZe80rdbDt8jN/21+q/CsUbTHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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