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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d53b9ae978917313b3e535d536d33c939b12a69ec1d248419b635d55239c4b' 
  AND token = 'DlondniEQ9SmWmvxi/j1gELMp2ZX2MUymxCYs4TrkLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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