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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8b4aab27db71bb4c85873d26448474cf6eb99c571e5a8be24a96dce46c9f77' 
  AND token = 'HRX4FbV/4igWbvIYdd0iN6YFZkQrYWiHu5+FHhICmac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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