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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79f36af5a95f75157ba341decb0b22bdbc5b86c754c3ea0506f3c9aff68ed2c' 
  AND token = 'mt2YtHMg49+T8FzKaSkVsghy2lo7iTvLSuI+XeLNyus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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