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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad02af7e88600a8f9f3229a41cd616dab3d9f2bdd2d3c7ae74da8892d1c1ff2a' 
  AND token = 'tigyfohd9ah1Yyz/OUc5HK9Y4KiNXFSAmsKfj8wH/Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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