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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf32dc4b7fbc5f7cc7c7e93498b0e8e4710278dd8d564ce9d709ca0176ab54a' 
  AND token = 'JABhK0HVny0P1FLq/d9C/ogs6d6bi2YdfkiTPO04Feo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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