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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab84b3989b3314e646cb1a9619173bf879efad7a140b56a3c94da411060a4564' 
  AND token = 'Ay7WzIvXK8j1ruJU53ZaH9HWGZuC70y8pHzDqnjQLoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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