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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc785cbf85bc22c2dea29774608ec1e278f76202cf172b77aa66240d8a14849' 
  AND token = 'q1s1n6MzIIfjXAlrh2M0fz7iM+h169mGjtWeHQDfZQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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