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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4c03912f5379278b85e422cb16436ef1f2d53ca6ef83e6c1335e5e60d320f7' 
  AND token = 'PkhX2QlvPJiXy7zRsTxGfKiaGV1a/jry/Vc2FUWhKzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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