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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2308fae9943727b80e499840000acd8a0a60d08af755c9e4a9af6934e31beeb9' 
  AND token = '30WCYyoNV3M2YkcwuQlBGoHZiLhtBSOwvL4qqK9b7uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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