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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf15de45f6f6388dfc66064e0810890bf949f416884266ba4dee5778e27fa7a' 
  AND token = 'ggLkXzsXXn3LC8qIT82fyuRpNc3L0vlunri41u6fxFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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