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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db42fc60824e4970067ec97ead63ea3d82bae913cc264383dd174b2cdacee07f' 
  AND token = 'mIQJC3vvSxGb0JBgBZuE94M9ieet99zlT7Mxc0CD9Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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