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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45bdb4af75f286d7f6ebc1fc9c364747fa6ab9c54909bc5535d393a2ae3ef0f' 
  AND token = '1YC7Oi6D1oZCk4iV/T05Y8HUueSATKnlC8z8GvRKa2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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