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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96c8e5c128f698465516f0b36323c6398a72e5f1379dc3e92a50312e6e04228' 
  AND token = '2178QSy7laY2peQ2Rup0f+TPYsfBkNZIS1AuJSf1udc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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