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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30238e8977766f1c03f9cc56709f07f0eb6fd02ccbb984daaf6c7092ea49d3e8' 
  AND token = 'ZpaPqL/gzFyEKo+Fv2rPyA9FsuEG+mkDiiAEima7sns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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