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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a656f968d4d05645598e77178f48601b56ff8621ceba2060add0081a7d5520' 
  AND token = 'PcYPxTkNB5a6Jy6DFmwgI+J6ksI+1mEGtPJJLqxhZDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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