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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba731fae3663c36c209c85104553852ec460b08f4293a20f1235452315e5a26' 
  AND token = 'bZLianmiqSYc+B0EBSOs3Wr5acH9uCAQOqZtPF6XH7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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