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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3fd7986609ca2b069ee941468140eaa472177420f5687261ae367e6ca8ff4a' 
  AND token = '3eYXDcY0FuFHOPoKUPfnZxE5HB9eXe6He1+JV6K8s1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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