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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd77186ae89c896fd528f241e58c06cd47545edc6b6c9765d8f944bc94246100' 
  AND token = 'e2xVoCItQ0UXx8A+jFoHMdi+uoLH9FLFjgdO3br+964=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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