SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799368eed3cc986a5e0b7ce894d6d38e15774684232b26f188e72cbdc431600c' 
  AND token = 'VRhAH8/K6WsuqJCSV2BjOHqpbm7Hufgvkf2w233Ka7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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