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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f98ee6413379352d449f61ea83d9e724b3f91b5a9aa79a887c696bc88d198b' 
  AND token = 'okbErRRH7+nd28iqjx679a5mB+kuY6RubuB2DZrOm9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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