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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34be47ec53cb0f7bc2cf2164cfe38ef1241c2e09eca87209f8a1be680b442ea4' 
  AND token = '4WDxYx7Ns0XiAIPRoi8rJIa1yiU3EqCtciAJnDm9SoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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