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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a041216df1be489fa810297d6201396068a74d68b539fd73d9909f0b8ab06068' 
  AND token = 'j7cC88K4MYj4JbeFLhht8u7BuCH8PtFWtxl8TgoMPXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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