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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb20fd8f44f7e7c0ac75c15feaec6a5df3add35b5b464d3a9a508c962d88c213' 
  AND token = 'gxh/3Gv4G999UJtoxO93YXhZbPPMUUI49T4lh/nlmNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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