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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9039af5fc301b88b767dcd28d7dad97e6ea9f29f7a634a7b778bf2cf544d01c0' 
  AND token = 'VqW2S/UmrNVwKRWA/+QUfCprGxEr7xJg8dVldy6DGU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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