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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9dfc6d60091e027e14de36636d4208ab1498027ad943e5fd515e8795eb2141' 
  AND token = '/fs7smvun6qDT2rFTA04knij0288Pkp2KhEucv10YmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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