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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88cb46d7248aeb6cf3bf1d16d799c504972aa18be6b2835b39c5555b66bd5eba' 
  AND token = 'yrx/FgY7gSC+newyvNEigT4Ye/57O+2EJLsKbxBMph0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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