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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d243142155dba7ec11c5ea940d8c76307a047f5e1ad82c931504632c8cdd93b' 
  AND token = 'rgTAdslg9WMZvcERHZYKgs4OV9gNYFPsplVxJVhtFsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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