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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20294174aaba56bc2dc6496d6580c99e8c0f5c85a4e8ed4862b4faf654317183' 
  AND token = '/efvswS+lq0kga58M7lQrvBdSh5ZN2gcSwvfecFnj8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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