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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f90e0ccf3244811d7c6623a446d46f8bd934cd82d9faabe24db1b726d0a7324' 
  AND token = '360GC8hNgE+LTIaVLUOIjEamKZpfg7aFvLQXqDQ7iqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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