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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f44020d26e8cae03877eae4023635cc00a06b9cb04c7b15231015c0266eced5' 
  AND token = 'QQRgyS0T0VvoNd+BphpK+HkFPhZvtliNZf/Cc3+Dw6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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