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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd7f368fc09eba9d1ea91a2ee28b7a5dc2d67d40baa9a35ce0041fb5427bc04' 
  AND token = 'p4mZaQLO8qBhJEE6lwvC0X3ceDY/emznAkRp5jXjRnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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