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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c47f3a2e16aefc4483d292ba47a90c6dd51025f684e70e6b3ea76f6883b3e0' 
  AND token = 'bcMaHHgy4hxyJ24OUR0KcI9xuf2ZY/8JsMMd/fB7XiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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