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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f380b634c8470c442e8fbedd9908426cfa19e9573ea1b22d0cc48e05517d7a' 
  AND token = 'bXEYf1ZactN0CTvR5ZU9+FckXJPOKPBKjgk0QGTyZ4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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