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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7344e4bc9439b207d648b50928938e21c823c5531501dc26fe55791667a747' 
  AND token = 'Guh1wm6bXX6EyU5us2jVloQZ84lA4C36Xz0CEPKyFDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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