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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414816bb1a9b55512c24875d95dc4d67b1f3d9a290ac5080d0b75d8251583190' 
  AND token = 'bYgQb+6HmjzwvS4em3Go3qRME9wvCA3XttOyuDqK7v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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