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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2172110c142997ce5593fcbcd1ea1636136bf5db5fe5dbcd03332af64c4b08' 
  AND token = 'kcy8v0lxo9KKBXo31uaD2Pg2RIrvvCZmUWOLBNd9TZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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